Cutter-head



J. GREEN. CUTTER HEAD.

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"NI-TED STATES JOHN GREEN, OF ST. LOUIS, MISSOURI.

CUTTER-H EAD.

SPECIFICATION forming part of Letters Patent No. 421,832, dated February18, 1890. Application filed March 14, 1889. Serial No. 303,284. (Nomodel.) 7

To all whom it may concern:

Be it known that 1, JOHN GREEN, of the city of St. Louis, in the Stateof Missouri, have invented a certain new and useful Improvement inGutter-Heads, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

This improvement relates, primarily, to cutter-heads for panel-raisingmachines; but I do not confine myself to this or any particularapplication of the cutter-head.

Figure I is aperspective view of the cutterhead. Fig. II is a top view.Fig. III is a side elevation showing the cutter-head upon a verticalshaft.

1 is the head-block, having a central hole 2 for the passage of theshaft 3.

4 are seats made in the bottom of the block to receive the shanks 5 ofthe cutters, and also wedges 6, by which they are firmly held in place.

7 are set=screws, whose ends bear against the wedges 6 to prevent theirmovement.

The blades 8 of the cutters are so curved as to out toward thecutter-shaft, being curved in such a manner that in all points of thecurved edges 9 10 the inclination of the edge to the line of movement ofthe cutter at that point always forms an acute angle 12 upon theoutside, and of course an obtuse angle 13 upon the inside, the lines ofmovement of the different points of the cutter being represented bybroken circles 11. Preferably the angles 12 at all points of the bladeare equal, so that the angle of out being correct for best work at onepoint is the same all the length of the blade 9 10.

The grain of the stud 14: is horizontal, and in order to leave a smoothsurface after the cutter-blade the edge of the blade is preferably setat a slight angle with the horizontal, as seen in Fig. III, where thebroken lines 15 15 represent a horizontal plane. It will be understoodthat as the blade cuts toward the shaft and the lower part of thedressed face of the stuff is upon that side there will be no tendency ofthe blade to roughen the face by This will be very apparent to any onehaving any knowledge of wood-working.

At 16 is shown a part of the blade, which is shaped to cut a bevel,bead, ogee, or other form at the edge of the plane face left by the part9 10 of the blade. The edge 910 may be so formed as to leave a surfacesomewhat concave or convex, no part of the surface in any case being outlower than a part nearer to the shaft 3, although it may be cut as low,the portion of the edge 9 10 of the blade in the latter case beinghorizontal between such parts. a

In order to brace the blades, and yet allow of their grinding withoutremoval from the head-block 1,1 provide removable and adjustable braces17, connected to the head by bolts 18, which pass through slots 19 inthe braces. The braces have at the end a hook 20, which engages over thetop of the cutterblade and prevents it from springing outward. Thus theblade is preserved from destruc tive strain and from vibration, and acomparatively light blade may be used for heavy work. The braces may beused for blades of different lengths, as the slots 19 allow theirendwise adjustment on the bolts 18.

I claim as my invention- 7 1. A rotary cutter-headhaving a curved bladeformed with a cutting=edge extending in a curve outwardly from the head,the outer end of the curve being in advance of a radial line extendingfrom the center of the cutterhead through the inner end of the curve,substantially as and for the purpose set forth.

2. A rotary cutter-head having a curved blade with a curved cutting-edgeon its inner lower side cutting toward the shaft of they cutter-head,substantially as set forth.

3. A rotary cutter-head having a curved blade with a cutting edge on itsinner lower side cutting toward the shaft of the cutterhead, and havingits edge inclined upward outwardly from the shaft, substantially as setforth.

t. A rotary cutter-head with a cutter blade curved from heel to pointforwardly from a line radial t0 the cutter-head andpassing through theheel of the cutter blade, and the edge of the cutter-blade having equal013- and adjustable brace 17 extending from the liquity at all pointswith circles concentric heacl-bl0ck 1tothecutter-blade,substantially Iowith the axis of the cutter-head, substantially as set forth.

as setforth.

5 5. A rotary cutter-head having a movable JOHN GREEN brace 17 extendingfrom the head-block 1 to In presence ofthe cutter-blade, substantiallyas set forth. SAML. KNIGHT,

6. A rotary cutter-head having removable EDW. S. KNIGHT.

